Improvement in boring-machines



` R. 0. M00 R HOU SE S. L. WIEGAN D.

Boring-Machines'.

Patented August I2, 1873.

UNITED STATES PATENT QFFICE.

ROBERT O. M-OORHOUSE AND S. LLOYD WIEGAND, OF PHILADELPHIA, PA. SAID WIEGAND ASSIGNOR TO SAID MOORHOUSE.

IMPROVEMENT IN BORING-MACHINES.

Specification forming part ot Letters Patent N o. 141,657, dated August 12, 1873 application led April 11, 1873.

To all whom t may concern:

Be it known that we, ROBERT O. MOOR- noUsE and S. LLOYD WIEGAND, both of the city and county of Philadelphia and State of Pennsylvania, have jointly invented certain new and useful Improvements in Boring-Bars for boring, facing, and turning cylinders 5 and do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings and letters of reference marked thereon.

The nature of this invention consists of an improved mechanism for operating the feeding-screw; an improved arrangement for adjusting the frame carrying the propelling-gearing 5 an improved device for centering the inner end of the bar when applied to a cylinder having a closed or contracted end.

The manner in which the said invention is made and operated may be ascertained by a person skilled in the art from the following detailed description and the drawings annexed and therein referred to. v

Figure l shows a longitudinal section of a steam-cylinder, marked X X X X, with the boring-bar applied; Fig. 2, an endview of the same Fig. 3, a section of the boringllead; Fig. 4, a plan of the boring-head; Fig. 5, a section of the bottom-centering device as applied to a closed cylinder end; Fig. 6, a plan of the centering device; Fig. 7, a section of the driving-gear and frame for attaching it to the cylinder; Fig. 8, a plan of the cross frame or spider used in boring cylinders having both ends open. Figs. 9 and 10, respectively, show plan and section of the feeding-gear.

A represents theboring-bar, having a sleeve, B, accurately fitted so as to slide thereon. The slecveB has radially-projecting arms, marked B1, formed on it, and is termed a cutter-head. A radial groove, B2, is made in each of the arms B1, in which grooves the cutting-tools B3 are fitted, and are held in place by clamps Bt fastened across them by bolts B5 screwedl into the arms B1. Through the arms B1, between the butts of the tools B3 and thesleeve B, are fitted tapering keys B6, which, by being moved lengthwise, (preferably by screws B7 formed on the ends of the keys BG, operated by nuts B,) force the cutters outward from the bar A,

so as to bore larger circles, affording a means of adjusting the cutters radially that is spe- ,cially advantageous in chamberin g or recessing cylinder-ends. The bar A is tted so as to turn freely, but without play, in bushings or sleeves A1\, and is prevented from moving` lengthwise through said sleeves by collars A2, which can be, adjusted lengthwise on the bar A and secured in position by set-screws A3. Into a groove formed in the bar A parallel with but eccentric to its axis is placed a screw, G, one end of which, markpd G1, projects bcyond the end of the bar A, and is so fitted that it can turn freely but not move lengthwise. A nut, C2, fixed securely to the sleeve B, engages 'in the threads of the screw C, and

limparts motion to the cutter-head lengthwise on the bar A when the screw C is rotated. C3 is an internal gear-wheel tted with a feather, Gi, on the end G1 of the screw C, so that when rotated the screw C must rotate with it, and gearing into the pinion C5. The proportions of the gear-wheel G3 and pinion G5, relatively to each other, to the diameter of the bar A, and to the eccentric position of the screw G, are such that the pinion G5 while engaging the teeth of the wheel O3 may be placed with itsI axis coincident with the axis of the bar A. The pinion C5 is fitted so as to turn freely in a bearing, C6, tted on the hub of the wheel O3 A projectingy arm of the bearing O6 contains a sliding bolt, G7, which, by means of a thumb-screw, C, may be held so as to retain one end of the bolt G7 in the end of the bar A in a hole drilled for that purpose, so as to maintain the same axial position of the pinion C5 and the bar A; or it may beheld so that the other end of the bolt G7 is confined in a hole in the crank C9, by which the pinion C5 is turned. When in this position the crank C9 operates as though fastened directly on the` screw C, and affords a convenient means of turning it rapidly by hand; and when bolted into the bar A, and the handle of the crank C9 is held stationary and the bar A rotated, the pinion G5 imparts a slow rotative motion through the internal wheel G3 to the screw G, which thus causesa steady and slow progressive movement of the cutter-head B along the bar A. The sleeves A1 are adjusted centrally by set-screws D in the slotted plates D, by which they are secured with screw-bolts and nuts to the cylinder X to be bored. The bar A receives rotary motion from the worm -wheel E, driven by the tangent-screw E1. The frame E2 has an annular T-shaped groove on the side toward the plate D, in which fit the heads of the bolts E3, by means of which it is fastened to the plate D, and can be readily turned so as to place the tangent-screw E1 in such angular position as to most readily apply the driving-power. F represents a step, into which the extremity of the boring-bar is tted so as to turn, and has four channeled arms, F1, in which slide the bars F2, which bars are simultaneously pressed radially outward by anut, F3, screwing on the outside of the step F, and forcing the oblique bars F4 against the bars F2.

This portion of the apparatus is specially useful in boring cylinders having one end closed or contracted, where the plate D could not conveniently be applied, and centers the bar in such cases with great facility and accuracy.

We are aware that apparatus for boring cylinders have been made and used embracing several features hereinbefore described, and we do not broadly claim the whole of the same to be new 5 but What we claim as our invention, and desire to secure as such by Letters Patent, is4

1. The combination of the internal gear and pinion with the feeding-screw, as shown and described.

2. The frame E2, worm-wheel and screw, and plate D combined, as shown and described.

` 3. The step F with the sliding bars, oblique bars, and nuts for simultaneously expanding the same, as described and shown.

R. O. MOORHOUSE. S. LLOYD WIEGAND.

Witnesses:

J AMES P. PETIT, JOHN B. DEVINE. 

